RTF / .DOC malware analysis — malicious · cb4087c9adfe7bb3

MALICIOUS

RTF / .DOC

218.0 KB First seen: 2022-04-18

MD5: eae8b81a66395f96ae58d12ba2fa44a9 SHA-1: 877b58487ae5c2fe14ebff874a7de7f927231d27 SHA-256: cb4087c9adfe7bb3296903315af9331916180710304dc4c5cf5534a87048e0d1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains embedded OLE objects and uses an ".objupdate" directive, indicating an attempt to activate embedded content. The document body explicitly instructs the user to 'download the document and click Enable Editing', a common lure for macro-enabled malware. The presence of multiple extracted binary artifacts suggests these are likely payloads or components of the malicious execution chain. No scripts were extracted, but the OLE object activation and lure point towards a downloader or dropper functionality.

Heuristics 6

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000095d.bin` `e277717b8544388dc347516704ba98dfd1e19145c2ded431fbd652f2bf5b2f2a`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	15757 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008a01.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x8A01	2632 bytes
`objdata_02_off00009fa4.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9FA4	12297 bytes

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